Please ask someone who knows the laws related to property for help. Bought a second-hand rough house. The ground on the first floor and under the floor was empty because there was no rammed foundation

Please ask someone who knows the laws related to property for help. Bought a second-hand rough house. The ground on the first floor and under the floor was empty because there was no rammed foundation at that time. You have two choices. First, the owners who have been selling houses demand compensation, and the subject matter of the house sale should meet the safety requirements. If you sell a house without telling you the situation when buying and selling it, it is a concealment of facts and there is contract fraud, and you should be liable for breach of contract. Second, sue the original developer for maintenance. The Property Law clearly stipulates that the parties have the right to claim tort liability within two years from the date when they know or should know. Therefore, whether the house is guaranteed or not, you have the right to sue the developer.